I'm pretty lazy so would prefer to just answer pointed questions but my biggest takeaways are. 1.) Make the GMAT your life. This means 4-6 months of every single day. Don't be scared to fail. The more you fail, the more concepts you'll get to really hone in on.
Verbal: My verbal score on my SAT was comical, if i recall i got like a 510. I'm a native speaker so can't really comment on how to approach this if you're a non-native but for me the biggest takeaways were the videos that Manhattan has (the ones with the weird sock puppet). These are great to get your SC up to the mid to upper 30's. After that Thursdays with Ron as well as doing every official problem and knowing why EVERY SINGLE answer is wrong. Manhattan has an amazing class for quant but i really, really dislike their approach to verbal. They focus way too much on stuff that isn't tested IMO. Meaning is everything on the GMAT, not little idiom or grammar rules. Knowing when to use and and when to use ,ing is absolutely crucial.
As far as CR goes i have no advice, i was consistently at 100% from the jump. RC I was abysmall at so i got a subscription to the economist and just tried to read multiple articles per day. I think focusing exclusively on SC is key. I was at the point where i'd average 30 seconds for every question in the
OG with around 97% accuracy. This makes the SC on the real thing a joke and gives you so much time to focus on tricky passages within RC and eliminating answers in the really hard CR questions.
I'll recap on quant later.